undefeated
Britishadjective
Explanation
Has your volleyball team won every single game this season? Then it's undefeated — it hasn't been beaten yet! You'll almost always find this adjective describing sports teams or players who haven't suffered a loss, like the undefeated tennis player who's won all of her matches or the basketball team that's been undefeated for four games. Undefeated adds the prefix un-, or "not," to defeated, "beaten," which we can trace back to the Vulgar Latin diffacere, "destroy."
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Nanos spent Saturday afternoon watching the undefeated University of Arizona Wildcats men’s basketball team pummel the Oklahoma State Cowboys, ignoring the stares and iPhones pointed his way from people in the crowd.
From The Wall Street Journal ● Aug. 2, 2026
The only other times they reached the Edison final was in 2015 when they won the Division 1 title and 2008 when they were undefeated state champs.
From Los Angeles Times ● Jul. 12, 2026
“But Mother Nature and Father Time remain undefeated, and the ‘deterioration bill’ is now coming due.”
From MarketWatch ● Jul. 7, 2026
Becket is undefeated at the Supreme Court, with 13 victories, six of them unanimous.
From The Wall Street Journal ● Jun. 29, 2026
He was already the undefeated school champion, as he had been, he told her, in his former school.
From "Americanah" by Chimamanda Ngozi Adichie
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
